svn commit: r291462 - in head/sys: conf powerpc/mpc85xx

Justin Hibbits jhibbits at FreeBSD.org
Mon Nov 30 02:23:57 UTC 2015


Author: jhibbits
Date: Mon Nov 30 02:23:56 2015
New Revision: 291462
URL: https://svnweb.freebsd.org/changeset/base/291462

Log:
  Add Freescale QorIQ GPIO driver.
  
  Still missing interrupt support, to come later.
  
  Sponsored by:	Alex Perez/Inertial Computing

Added:
  head/sys/powerpc/mpc85xx/qoriq_gpio.c   (contents, props changed)
Modified:
  head/sys/conf/files.powerpc

Modified: head/sys/conf/files.powerpc
==============================================================================
--- head/sys/conf/files.powerpc	Sun Nov 29 22:37:48 2015	(r291461)
+++ head/sys/conf/files.powerpc	Mon Nov 30 02:23:56 2015	(r291462)
@@ -142,6 +142,7 @@ powerpc/mpc85xx/mpc85xx_gpio.c	optional	
 powerpc/mpc85xx/platform_mpc85xx.c	optional	mpc85xx | qoriq_dpaa
 powerpc/mpc85xx/pci_mpc85xx.c	optional	pci mpc85xx | pci qoriq_dpaa
 powerpc/mpc85xx/pci_mpc85xx_pcib.c	optional	pci mpc85xx | pci qoriq_dpaa
+powerpc/mpc85xx/qoriq_gpio.c	optional	mpc85xx gpio | qoriq_dpaa gpio
 powerpc/ofw/ofw_machdep.c	standard
 powerpc/ofw/ofw_pci.c		optional	pci
 powerpc/ofw/ofw_pcibus.c	optional	pci

Added: head/sys/powerpc/mpc85xx/qoriq_gpio.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/powerpc/mpc85xx/qoriq_gpio.c	Mon Nov 30 02:23:56 2015	(r291462)
@@ -0,0 +1,309 @@
+/*-
+ * Copyright (c) 2015 Justin Hibbits
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <sys/gpio.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <machine/stdarg.h>
+
+#include <dev/gpio/gpiobusvar.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "gpio_if.h"
+
+#define MAXPIN		(31)
+
+#define VALID_PIN(u)	((u) >= 0 && (u) <= MAXPIN)
+
+#define GPIO_LOCK(sc)			mtx_lock(&(sc)->sc_mtx)
+#define	GPIO_UNLOCK(sc)		mtx_unlock(&(sc)->sc_mtx)
+#define GPIO_LOCK_INIT(sc) \
+	mtx_init(&(sc)->sc_mtx, device_get_nameunit((sc)->dev),	\
+	    "gpio", MTX_DEF)
+#define GPIO_LOCK_DESTROY(_sc)	mtx_destroy(&_sc->sc_mtx);
+
+#define	GPIO_GPDIR	0x0
+#define	GPIO_GPODR	0x4
+#define	GPIO_GPDAT	0x8
+#define	GPIO_GPIER	0xc
+#define	GPIO_GPIMR	0x10
+#define	GPIO_GPICR	0x14
+
+
+struct qoriq_gpio_softc {
+	device_t	dev;
+	device_t	busdev;
+	struct mtx	sc_mtx;
+	struct resource *sc_mem;	/* Memory resource */
+};
+
+static device_t
+qoriq_gpio_get_bus(device_t dev)
+{
+	struct qoriq_gpio_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	return (sc->busdev);
+}
+
+static int
+qoriq_gpio_pin_max(device_t dev, int *maxpin)
+{
+
+	*maxpin = MAXPIN;
+	return (0);
+}
+
+/* Get a specific pin's capabilities. */
+static int
+qoriq_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
+{
+
+	if (!VALID_PIN(pin))
+		return (EINVAL);
+
+	*caps = (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_OPENDRAIN);
+
+	return (0);
+}
+
+/* Get a specific pin's name. */
+static int
+qoriq_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
+{
+
+	if (!VALID_PIN(pin))
+		return (EINVAL);
+
+	snprintf(name, GPIOMAXNAME, "qoriq_gpio%d.%d",
+	    device_get_unit(dev), pin);
+	name[GPIOMAXNAME-1] = '\0';
+
+	return (0);
+}
+
+/* Set flags for the pin. */
+static int
+qoriq_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+	uint32_t reg;
+
+	if (!VALID_PIN(pin))
+		return (EINVAL);
+
+	if ((flags & (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT)) ==
+	    (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	if (flags & GPIO_PIN_INPUT) {
+		reg = bus_read_4(sc->sc_mem, GPIO_GPDIR);
+		reg &= ~(1 << (31 - pin));
+		bus_write_4(sc->sc_mem, GPIO_GPDIR, reg);
+	}
+	else if (flags & GPIO_PIN_OUTPUT) {
+		reg = bus_read_4(sc->sc_mem, GPIO_GPDIR);
+		reg |= (1 << (31 - pin));
+		bus_write_4(sc->sc_mem, GPIO_GPDIR, reg);
+		reg = bus_read_4(sc->sc_mem, GPIO_GPODR);
+		if (flags & GPIO_PIN_OPENDRAIN)
+			reg |= (1 << (31 - pin));
+		else
+			reg &= ~(1 << (31 - pin));
+		bus_write_4(sc->sc_mem, GPIO_GPODR, reg);
+	}
+	GPIO_UNLOCK(sc);
+	return (0);
+}
+
+/* Set a specific output pin's value. */
+static int
+qoriq_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+	uint32_t outvals;
+	uint8_t pinbit;
+
+	if (!VALID_PIN(pin) || value > 1)
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	pinbit = 31 - pin;
+
+	outvals = bus_read_4(sc->sc_mem, GPIO_GPDAT);
+	outvals &= ~(1 << pinbit);
+	outvals |= (value << pinbit);
+	bus_write_4(sc->sc_mem, 0, outvals);
+
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+/* Get a specific pin's input value. */
+static int
+qoriq_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *value)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+
+	if (!VALID_PIN(pin))
+		return (EINVAL);
+
+	*value = (bus_read_4(sc->sc_mem, GPIO_GPDAT) >> (31 - pin)) & 1;
+
+	return (0);
+}
+
+/* Toggle a pin's output value. */
+static int
+qoriq_gpio_pin_toggle(device_t dev, uint32_t pin)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+	uint32_t val;
+
+	if (!VALID_PIN(pin))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+
+	val = bus_read_4(sc->sc_mem, GPIO_GPDAT);
+	val ^= (1 << (31 - pin));
+	bus_write_4(sc->sc_mem, 0, val);
+	
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+qoriq_gpio_probe(device_t dev)
+{
+
+	if (!ofw_bus_is_compatible(dev, "fsl,qoriq-gpio"))
+		return (ENXIO);
+
+	device_set_desc(dev, "Freescale QorIQ GPIO driver");
+
+	return (0);
+}
+
+static int qoriq_gpio_detach(device_t dev);
+
+static int
+qoriq_gpio_attach(device_t dev)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+	int rid;
+
+	sc->dev = dev;
+
+	GPIO_LOCK_INIT(sc);
+
+	/* Allocate memory. */
+	rid = 0;
+	sc->sc_mem = bus_alloc_resource_any(dev,
+		     SYS_RES_MEMORY, &rid, RF_ACTIVE);
+	if (sc->sc_mem == NULL) {
+		device_printf(dev, "Can't allocate memory for device output port");
+		qoriq_gpio_detach(dev);
+		return (ENOMEM);
+	}
+
+	sc->busdev = gpiobus_attach_bus(dev);
+	if (sc->busdev == NULL) {
+		qoriq_gpio_detach(dev);
+		return (ENOMEM);
+	}
+
+	OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev);
+
+	return (0);
+}
+
+static int
+qoriq_gpio_detach(device_t dev)
+{
+	struct qoriq_gpio_softc *sc = device_get_softc(dev);
+
+	gpiobus_detach_bus(dev);
+
+	if (sc->sc_mem != NULL) {
+		/* Release output port resource. */
+		bus_release_resource(dev, SYS_RES_MEMORY,
+				     rman_get_rid(sc->sc_mem), sc->sc_mem);
+	}
+
+	GPIO_LOCK_DESTROY(sc);
+
+	return (0);
+}
+
+static device_method_t qoriq_gpio_methods[] = {
+	/* device_if */
+	DEVMETHOD(device_probe, 	qoriq_gpio_probe),
+	DEVMETHOD(device_attach, 	qoriq_gpio_attach),
+	DEVMETHOD(device_detach, 	qoriq_gpio_detach),
+
+	/* GPIO protocol */
+	DEVMETHOD(gpio_get_bus, 	qoriq_gpio_get_bus),
+	DEVMETHOD(gpio_pin_max, 	qoriq_gpio_pin_max),
+	DEVMETHOD(gpio_pin_getname, 	qoriq_gpio_pin_getname),
+	DEVMETHOD(gpio_pin_getcaps, 	qoriq_gpio_pin_getcaps),
+	DEVMETHOD(gpio_pin_get, 	qoriq_gpio_pin_get),
+	DEVMETHOD(gpio_pin_set, 	qoriq_gpio_pin_set),
+	DEVMETHOD(gpio_pin_setflags, 	qoriq_gpio_pin_setflags),
+	DEVMETHOD(gpio_pin_toggle, 	qoriq_gpio_pin_toggle),
+
+	DEVMETHOD_END
+};
+
+static driver_t qoriq_gpio_driver = {
+	"gpio",
+	qoriq_gpio_methods,
+	sizeof(struct qoriq_gpio_softc),
+};
+static devclass_t qoriq_gpio_devclass;
+
+EARLY_DRIVER_MODULE(qoriq_gpio, simplebus, qoriq_gpio_driver,
+    qoriq_gpio_devclass, NULL, NULL,
+    BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);


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